Increasing heart rate and diminishing pressure is an indication to SEE THE DOCTOR IMMEDIATELY. You are slipping into shock

At this age, this should be investigated as HEART ATTACK or LEAKING ANEURYSM – UNLESS PROVED OTHERWISE – especially so, in the background of previous heart attack and AAA. In suspected heart attack or leaking aneurysm, TIME IS OF THE ESSENCE – if detected early, an attack may even be aborted / the amount of damage and complications can be reduced remarkably. The most important time is the first few hours.

You MUST GO THE EMERGENCY DEPARTMENT - IMMEDIATELYBetter be safe than sorry - treated if a problem is found / Happy, if it turns out otherwise